The drama is an action suspense which follows college student sisters named Kai and Riku. They were spending every day peacefully, but one day, their father gets arrested on suspicion of burglary and murder. In order to return 100 million yen that is supposed to have been stolen by the father, the sisters become bounty hunters, and chase after 4 criminals.
Set in the ruins of Tokyo in the near future, a small group of female survivors face the impending extinction of humanity. They are forced to use violence in the face of bioterrorism and other threats. While some women accept their fate as the last generation of humans, others see biological engineering as a final hope for the survival of the species.
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